locksrv/checkparcel: Always do the long-form predecessor check
locksrv/checkparcel: Always do the long-form predecessor check

- Always check each predecessor chunk against the keyring difference list.
Before, we would only perform this check if the number of predecessor chunks
was different from than number of keyring differences, but this test would
miss the case where the correct number of chunks were stored in the wrong
places.

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr